Friday 1 November 2019

Repair (fixing back) lifted power thru hole pad+trace


Attached pictures are a lifted power pad+trace of a 1000W PSU of a commercial subwoofer. Caliper showed 0.42mm thick, which if correct gives about 12oz copper trace!


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In this particular pad was the source of a mosfet after rectifier bridge, transformer and capacitors bank.


Pad+trace are intact, I just need to reliably fix them back to place.


What are the best options? Epoxy? Maybe araldite? I am not sure if it will ever corrode copper or sensitive electronics.




Answer



Epoxy should be a great choice. I would tape the back of the circuit board so that the epoxy can go in the hole and self-level, put the epoxy in, and then use tape to hold the trace down.


After that, you'll need to re-drill the hole for the replacement component. The existing hole was probably plated through; if it was, you will need to solder the component onto both the top and bottom traces.


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